3.6 Migration from packaging to foodsThe direct contact between food and packaging materials provides the potential for migration. Additive migration describes the physico-chemical migration of molecular species and ions from the packaging into food. Such interactions can be used to the advantage of the manufacturer and consumer in active and intelligent packaging, but they also have the potential to reduce the safety and quality of the product, thereby limiting product shelf life.Much work has been carried out into the migration of substances from packaging into food. This has included the development of methods for the identification and diagnosis of problems using chemical and sensory assessment. The kinetics of migration have been modelled to allow prediction of the extent of migration over the shelf life of the product. In the UK, a number of surveillance exercises have been undertaken into the levels of particular migrants in foods (Table 3.5). The history of these surveillance exercises provides a useful summary of the concerns surrounding food contact materials over recent years.
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